Importance of Recovery of E. coli in Water Following Ultraviolet Light Disinfection
Importance of Recovery of E. coli in Water Following Ultraviolet Light Disinfection
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紫外线消毒后水中大肠杆菌回收的重要性
DOI：
10.1061/(asce)ee.1943-7870.0000922
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发表时间：
2015
影响因子：
2.2
通讯作者：
K. Linden
中科院分区：
文献类型：
--
作者：
Z. Bohrerova;J. Rosenblum;K. Linden
摘要研究了大肠杆菌在两种不同水源中的光修复和暗恢复。消毒的饮用水和废水处理后再利用，掺入野生E。大肠杆菌分离株或实验室购买的E.大肠杆菌菌株和紫外线（UV）照射的能量密度从40至120 mJ/cm 2。虽然没有确定阈值紫外线通量，但E。大肠杆菌光暗修复没有进行，修复程度普遍较低，不超过0.5 log。与修复结果相反，E.大肠杆菌消毒存活率达到3log，可能是由于剩余的灭活大肠杆菌。大肠杆菌细胞作为消毒后可生物降解碳的来源。虽然有人提出，饮用水和回用水紫外线消毒条件下的细菌修复的关注是高估了实验的基础上，在低紫外线通量，长期消毒后的水的安全性可能被低估的条件下，低或无消毒残留物。
AbstractEscherichia coli photorepair and dark recovery was investigated in two different water sources. Sterilized drinking water and wastewater effluent treated for reuse were spiked with either wild E. coli isolate or a laboratory-purchased E. coli strain and ultraviolet (UV)-irradiated at fluences from 40 to 120 mJ/cm2. Although no threshold UV fluence was established after which E. coli photo and dark repair did not proceed, the extent of repair was generally low, not exceeding 0.5 log. Contrary to the repair results, the 48-h regrowth of E. coli disinfection survivors reached up to 3 log, likely due to the remaining inactivated E. coli cells that served as a source of biodegradable carbon postdisinfection. Although it is proposed that concerns regarding bacterial repair under drinking and reuse water UV disinfection conditions are overestimated based on experiments at low UV fluences, the long-term postdisinfection safety of water may be underestimated for conditions of low or no disinfection residu...